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CanvasItem

Description

The module CanvasItem exports basic classes and general functionality on canvas items.

Synopsis

data Canvas data BitMapHandle = Predefined String | BitMapHandle BitMap | BitMapFile String data BitMap class HasCoords w where coord :: Coord -> Config w getCoord :: w -> IO Coord class (GUIObject w) => CanvasItem w class (CanvasItem w) => FilledCanvasItem w where filling :: (ColourDesignator c) => c -> Config w getFilling :: w -> IO Colour outline :: (ColourDesignator c) => c -> Config w getOutline :: w -> IO Colour stipple :: BitMapHandle -> Config w getStipple :: w -> IO BitMapHandle outlinewidth :: Distance -> Config w getOutlineWidth :: w -> IO Distance class (CanvasItem w) => SegmentedCanvasItem w where splinesteps :: Int -> Config w getSplinesteps :: w -> IO Int smooth :: Bool -> Config w getSmooth :: w -> IO Bool moveItem :: (Synchronized w, CanvasItem w) => w -> Distance -> Distance -> IO () scaleItem :: (Synchronized w, CanvasItem w) => w -> Distance -> Distance -> Double -> Double -> IO () raiseItem :: (CanvasItem ci, CanvasItem w) => ci -> w -> IO () lowerItem :: (CanvasItem ci, CanvasItem w) => ci -> w -> IO () putItemOnTop :: (CanvasItem w) => w -> IO () putItemAtBottom :: (CanvasItem ci) => ci -> IO () itemsNotOnSameCanvas :: IOError

Documentation

data Canvas

The Canvas datatype.

data BitMapHandle

The BitMapHandle datatype - a handle for a bitmap resource. Constructors Predefined String BitMapHandle BitMap BitMapFile String Instances BitMapDesignator BitMapHandle

data BitMap

The BitMap datatype.

class HasCoords w where

You can set the coords (position / size) of a canvas item on the parent canvas. Methods coord :: Coord -> Config w Sets the coord(s) of a canvas item on the parent canvas. getCoord :: w -> IO Coord Gets the coord(s) of a canvas item on the parent canvas. Instances (CanvasItem w) => HasCoords w

class (GUIObject w) => CanvasItem w

Any canvas item is an instance of the abstract class CanvasItem. Instances CanvasItem Arc CanvasItem BitMapItem CanvasItem CanvasTag CanvasItem EmbeddedCanvasWin CanvasItem ImageItem CanvasItem Line CanvasItem Oval CanvasItem Polygon CanvasItem Rectangle CanvasItem TextItem

class (CanvasItem w) => FilledCanvasItem w where

Methods filling :: (ColourDesignator c) => c -> Config w Sets the filling of a canvas item. getFilling :: w -> IO Colour Gets the filling of a canvas item. outline :: (ColourDesignator c) => c -> Config w Sets the outline colour of a canvas item. getOutline :: w -> IO Colour Gets the outline colour of a canvas item. stipple :: BitMapHandle -> Config w Sets the stipple configuration of a canvas item. getStipple :: w -> IO BitMapHandle Gets the stipple configuration of a canvas item. outlinewidth :: Distance -> Config w Sets the outline width of a canvas item. getOutlineWidth :: w -> IO Distance Gets the outline width of a canvas item. Instances FilledCanvasItem Arc FilledCanvasItem BitMapItem FilledCanvasItem Line FilledCanvasItem Oval FilledCanvasItem Polygon FilledCanvasItem Rectangle FilledCanvasItem TextItem

class (CanvasItem w) => SegmentedCanvasItem w where

Segmented canvas items have a splinesteps and smooth configuration. Methods splinesteps :: Int -> Config w Sets the number of line segments that approximate the spline. getSplinesteps :: w -> IO Int Gets the number of line segments that approximate the spline. smooth :: Bool -> Config w Sets the smooth configuration (if true a spline curve is drawn around the points). getSmooth :: w -> IO Bool Gets the actual smooth setting. Instances SegmentedCanvasItem Line SegmentedCanvasItem Polygon

moveItem :: (Synchronized w, CanvasItem w) => w -> Distance -> Distance -> IO ()

Moves a canvas item horizontally and vertically by the given distances.

scaleItem :: (Synchronized w, CanvasItem w) => w -> Distance -> Distance -> Double -> Double -> IO ()

Scales a canvas item horizontally and vertically by the given distances.

raiseItem :: (CanvasItem ci, CanvasItem w) => ci -> w -> IO ()

Moves an item above another item in the display list.

lowerItem :: (CanvasItem ci, CanvasItem w) => ci -> w -> IO ()

Moves an item below another item in the display list.

putItemOnTop :: (CanvasItem w) => w -> IO ()

Puts an item on top of the display list.

putItemAtBottom :: (CanvasItem ci) => ci -> IO ()

Puts an items at bottom of the display list.

itemsNotOnSameCanvas :: IOError

Exception raised by CanasItem.onSameCanvas.

Produced by Haddock version 0.3